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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button id="btn">CLICK</button>
    <script>
        btn.onclick = function () {
            const p = new Promise((resolve, reject) => {
                // 1.创建化对象
                const xhr = new XMLHttpRequest()

                // 2.初始化
                xhr.open('GET', 'https://api.apiopen.top/api/sentences')

                // 3.发送
                xhr.send()

                // 4.处理响应结果
                xhr.onreadystatechange = function () {
                    if (xhr.readyState == 4) {
                        // 判断响应状态码
                        xhr.status >= 200 && xhr.status < 300
                            ? resolve(xhr.response)
                            : reject(xhr.status)
                    }
                }
            })

            p.then((value) => {
                console.log(value)
            }, (response) => {
                console.log(response)
            })
        }


    </script>
</body>

</html>